docs: def unlock(self, key, cas):
          """Unlock a Locked Key in Couchbase.
  
          This unlocks an item previously locked by :meth:`lock`
  
          :param key: The key to unlock
          :param cas: The cas returned from :meth:`lock`'s
              :class:`.Result` object.
  
          See :meth:`lock` for an example.
  
          :raise: :exc:`.TemporaryFailError` if the CAS supplied does not
              match the CAS on the server (possibly because it was
              unlocked by previous call).
  
          .. seealso:: :meth:`lock` :meth:`unlock_multi`
          """
          return _Base.unlock(self, key, cas=cas)